| Election Name: | 1991 Hemsworth by-election |
| Type: | parliamentary |
| Country: | United Kingdom |
| Seats For Election: | Constituency of Hemsworth |
| Ongoing: | no |
| Previous Election: | 1987 United Kingdom |
| Previous Year: | 1987 |
| Election Date: | 7 November 1991 |
| Candidate1: | Derek Enright |
| Party1: | Labour Party (UK) |
| Popular Vote1: | 15,895 |
| Percentage1: | 66.3% |
| Swing1: | 0.7% |
| Candidate2: | Valerie Megson |
| Party2: | Liberal Democrats (UK) |
| Popular Vote2: | 4,808 |
| Percentage2: | 20.1% |
| Swing2: | 4.3% |
| Candidate3: | Garnett Harrison |
| Party3: | Conservative Party (UK) |
| Popular Vote3: | 2,512 |
| Percentage3: | 10.5% |
| Swing3: | 6.7% |
| MP | |
| Posttitle: | Subsequent MP |
| Before Election: | George Buckley |
| Before Party: | Labour Party (UK) |
| After Election: | Derek Enright |
| After Party: | Labour Party (UK) |
| Turnout: | 42.6% (33.1%) |
| Next Election: | 1992 United Kingdom general election |
| Next Year: | 1992 |
The 1991 Hemsworth by-election was a parliamentary by-election held in England on 7 November 1991 for the House of Commons constituency of Hemsworth in West Yorkshire. The seat had become vacant upon the death on 14 September of the Labour Member of Parliament George Buckley, who had held the seat since the 1987 general election.
The Labour candidate, Derek Enright, held the seat for his party.